Cylinder head construction



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Patented Oct. 24, 1944 CYLINDER HEAD CONSTRUCTION Earl Ginn, NorthMuskegon, Harold Leslie Casselman, Muskegon, and Dana A. Campbell,Spring Lake, Mich., assignors to Continental Motors Corporation,Muskegon, Micln, a corporation of Virginia Original application April 9,1942, Serial No.

438,244. Divided and this application February 11, 1943, Serial No.475,519

4 Claims. (Cl. 123-173) Our invention relates to an improved cylinderhead construction and more especially to a cylinder head structureconstructed for cooperative assembly with the cylinder block of anover-head valve internal combustion engine.

This application is a division of our copending' application for UnitedStates Letters Patent Ser. No. 438,244, filed April 9, 1942, entitledCylinder head and combustion chamber construction.

In this type. of engine the combustion chambers are carried in thecylinder head structure and are arranged to over-lie the enginecylinders. In the present day high output engines it is nec essary toemploy large intake and exhaust valves and to provide as large a portarea as is possible.

An object of our present invention is to construct an improved cylinderhead structure which embodies a recessed portion for housing a pluralityof sets of rocker arms, and which is so constructed as to drain oilaccumulations from said rocker arm. housing.

Other objects of our present invention pertain to various structuraldetails described and claimed in particular detail hereafter.

For a more detailed understanding of our invention, reference may be hadto the accompanying drawings illustrating a preferred embodiment of ourinvention, wherein like figures refer to like parts throughout theseveral views and in which:

Fig. l is a bottom plan view of the cylinder head structure embodyingour invention,

Fig. 2 is a top plan view of the cylinder head structure, and

Figs. 3, 4 and are detail transverse sectional views through thecylinder head structure taken substantially on the lines 33, 4-4, and5-5 respectively in Fig. 1. p

The cylinder head structure herein illustrated by these several figuresprovides improved engine performance, and said head structure ispreferably formed of a casting A which may be bolted in the usual mannerto an engine cylinder block B by means of suitable bolts. The preferredconstruction embodies a structure overlying a plurality of cylinders ill(see Figs. 2 and 4) and is provided with combustion chambers llcooperatively associated with each of the engine cylinders. The cylinderhead is provided with intake and exhaust passages l2 and 13 respectivelyterminating in intake and exhaust ports 14 and I5, as more particularlyshown in Figs. 3 and 5. The said ports have valve seats 16 fittedtherein; the one illustrated being the intake valve seat. An intakevalve I1 is operable to control this intake port l4 and it will be seenthat same opens inwardly of the combustion chamber and substantiallyaxially inwardly of the cylinder Ill. The side walls 20 and 2| of saidcombustion chamber are constructed somewhat spherical in contour thusproviding immediately for a maximum clearance between the unseated valveheads 22 and the adjacent combustion chamber wall, said clearance beingincreased as the valve opens, to provide more space or area throughwhich thegases may fiow without being restricted.

The upper portion of the cylinder structure is recessed as at 30, andthe rocker arms are assembled in this recess or pocket in a conventionalmanner, same being mounted on the conventional rocker arm shaft (notshown) supported in bearings 3| which may be mounted on the bearingsupports 3! rising from the floor 33 of the recess 30. The floor 33 ofthis recess or pocket 30 is sloped or inclined, as clearly shown inFigs. 3 to 5, to drain any oil accumulations to one side of the cylinderhead. Preferably the low point of the floor 33 is in that region wherethe push rods 36 are operable. head is provided with suitable openings35 which support a push rod housing 36 and the oil accumulations aredrained from the pocket or recess 30 into the push rod housing 38 andthence preferably into the oil return or oil drainage tubes. As will benoticed in Fig. 2, the bearings 3! projecting from the floor formpartitions extending transversely of the recess in the lowermost portionof said recess to form a plurality of compartments into which the oilwill drain, one or more push rod housings communicating with each ofsaid compartments.

It will be observed that the cylinder head structure herein illustratedfacilitates economical engine manufacture and furthermore functions toprovide for improved engine performance.

Although I have illustrated but one form of our invention and havedescribed in detail but a single application thereof, it will beapparent to those skilled in the art to which our invention pertains,that various modifications and changes may be made therein withoutdeparting from the spirit of our invention or from the scope of theappended claims.

We claim:

1. A cylinder head structure for an internal combustion engine andcomprising a rocker arm housing provided with a recessed portion housinga plurality of rocker arm bearings rising from the floor of saidrecessed portion, the floor of said recessed portion comprising asubstantially plane The cylinder surface lying below the rocker armbearings and sloping downwardly to one side of said cylinder neadstructure, said bearings extending transversely of said recessed portionand torming partitions which divide the recessed portion intocompartments, said structure having a plurality of openings throughwhich valve push rods are extended and through which said oilaccumulations are drained oil" from said compartments.

2. A cylinder head structure for an internal combustion engine andcomprising a rocker arm, provided with a recessed portion housing aplurality of rocker arm bearings rising from the floor of said recessedportion and forming partitions which divide said recessed portion intocompartments, the floor of said recessed portion comprising asubstantially plane surface lying below the rocker arm bearings andsloping downwardly to one side of said cylinder head structure andconstructed to drain lubricating oil into said compartments, and meansdraining off said lubricating oil from each of said compartments.

3. A cylinder head structure for an internal combustion engine andcomprising a rocker arm, provided with a recessed portion housing aplurality of sets of rocker arm bearings rising from the floor of saidrecessed portion and forming partitions which divide said recessedportion into a plurality oi! compartments, the floor 01' said recessedportion being inclined to drain oil accumulations to one side of thecylinder head structure and into said compartments, and oil drainagemeans comprising oil drain openings in substantially the deepest part ofeach of said compartments.

4. A cylinder head structure for an internal combustion engine andcomprising a rocker arm, provided with a recessed portion housing aplurality of rocker arm bearings rising from the floor of said recessedportion and extending transversely of said head structure and part wayof said recessed portion to form partitions whereby to providecompartments aligned along one side of head structure, the floor of saidrecessed portion being inclined to drain oil accumulations to that sideof the cylinder head structure into said compartments, and oil drainagemeans comprising a plurality of aligned oil drain openings spacedlongitudinally of the engine and oil conducting drainage tubes connectedwith said drain openings, at least one of said oil drainage tubescommunicating with each of said compartments.

EARL GINN. HAROLD LESLIE CASSELMAN. DANA A. CAMPBELL.

